University of Tasmania, Australia

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Calman 1904


Phylum Arthropoda
Subphylum Crustacea
Class Malacostraca
Subclass Eumalacostraca
Superorder Peracarida

Distinguishing characteristics

  • Possess single pair of maxillipeds (rarely 2-3).
  • Mandibles with an articulated accessory process between molar and incisor teeth.
  • Carapace often reduced in size and not fused with posterior thoracic somites.
  • Carapace used to brood eggs.
  • Basal-most segments of legs bear thin flattened plates that enclose a ventral brood pouch known as a marsupium.


  • Worldwide.


  • Young hatch at a post-larval stage that resembles the adults but lacks the last pair of legs.